Non-load-bearing, drug-eluting components that can be added to load bearing spinal implants. The invention also relates to a use of the invented wave-power plant and to a method for producing electric energy. Four arms project in a radial direction from the rotating shaft and include four paddles with respective stirring blades spaced from each other in an axial direction on the rotating shaft. The central raised housing includes a horizontal or inclined top member and an upstanding peripheral wall connecting the top member with the central bottom frame in the supporting base. The receiver 11 of the wireless microphone has the infrared interface 11c. A scan may be performed based on the selected scan type.